Molds & Tooling
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PPO Gate Marks and Whitening
Problem Phenomenon
[Problem Phenomenon] Obvious whitening marks after gate removal on PPO products
Cause Analysis
High shear stress concentrates in the gate area, and the brittle fracture surface whitens when cut; oversized gate design or location on the appearance surface aggravates the mark; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Place the gate on a non-appearance surface or use overlap feeding; keep trimming tools sharp; pinpoint and submarine gates automatically cut off to reduce marks; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO gate marks are controlled by both position design and sharp trimming; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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